I’ve just got my Ringo for Christmas and I’ve ported my game Anarch to it. It is a completely public domain FPS game inspired by games like Doom and Wolf3D, made from scratch and to be very portable. Here is its website.
To port it I just had to write a small frontend (fewer than 200 LOC). I wanted to use EEPROM for saving progress, but that somehow didn’t work (I think the firmware uses it), so it’s using the SD now. Also I’ve noticed that even though the TFT library accepts 565 colors, it displays them as 332, so the colors are a bit distorted when compared to other versions. The sound only plays beeps as I didn’t find a simple way to play sounds from memory, the sound lib can only play wav files. FPS is set to 35, even though I think it could go higher. I think the port could be improved, but I am pretty lazy and don’t like developing for Arduino, so if anyone feels like it, you can do it